Hi, I am doing testing work on network protocols and there is one possible issue I noticed in RIP: When packet command is RIP_CMD_UPDATE_REQUEST, the protocol will call function rip_receive_request to respond to request called from rip_rx_hook. In RFC2453: https://datatracker.ietf.org/doc/html/rfc2453#section-3.9.1 Examine the list of RTEs in the Request one by one. For each entry, look up the destination in the router's routing database and, if there is a route, put that route's metric in the metric field of the RTE. If there is no explicit route to the specified destination, put infinity in the metric field. Once all the entries have been filled in, change the command from Request to Response and send the datagram back to the requestor. However in the function rip_receive_request, it seems that only one rte is examined. Could you please take a look at this part? I would really appreciate it. Thank you! Best, Mingwei